I'm off work today and so glad.
Yesterday I experienced concentration problems. I was fine with my job but when it came to talking to my co-workers - I simply wasn't listening. My husband came and ate lunch with me and he asked if I was ok. He said I seemed distant.
Today I woke to the same cloudiness as yesterday. It really doesn't bother me that much, as long as it doesn't affect my job then 'whatever'.